1998 Chevrolet Cavalier Z24, 2D Convertible, StandardFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . Store FREEZE FRAME and FAILURE RECORDS data for conditions which set code. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, check for MAP or TP sensor DTCs. If DTCs are present, go to appropriate DTC for diagnosis. If DTCs are not present, go to next step.
  3. Scan A/C high side value. If high side value is greater than 279 psi (3.0 volts), go to next step. If high side value is not greater than 279 psi (3.0 volts), go to step 10).
  4. Turn ignition off. Disconnect A/C pressure sensor connector. Connect DVOM between battery voltage and A/C refrigerant pressure sensor ground circuit. If battery voltage is present, go to next step. If battery voltage is not present, go to step 6).
  5. Using DVOM, check voltage between ground and A/C refrigerant pressure sensor signal circuit. If voltage reading is greater than 0.5 volt, go to step 7). If voltage reading is not greater than 0.5 volt, go to step 8).
  6. Check for open or poor connection in A/C refrigerant pressure sensor ground circuit. Repair as necessary. After repairs, go to step 10). If circuit and connections are okay, go to step 9).
  7. Check for short to voltage in A/C refrigerant pressure sensor signal circuit. Repair as necessary. After repairs, go to step 10). If circuit is okay, go to step 9).
  8. Replace A/C refrigerant pressure sensor. After replacing sensor, go to step 10).
  9. Replace PCM. Prior to replacement, check PCM terminals, connectors and wiring harness for damage. After replacing PCM, go to next step.
  10. Clear DTCs. Start engine and idle to normal operating temperature. Operate vehicle within conditions which set code. If scan tool indicates this code diagnostic has ran and passed, go to next step. If scan does not indicate that test ran and passed, repeat step 2).
  11. Check if additional DTCs are set. Diagnose affected DTCs. If no additional DTCs are set, system is okay. See DIAGNOSTIC AIDS.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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